Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: airlines and hours on this route all land within a few points of 86% on time.

Nonstops


Alaska	PDX	ONT	2h 21m	87%	1.1%	1,021	Flying now
Frontier	PDX	ONT	2h 22m	80%	0.0%	60	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Ontario on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	PDX 05:10 → OAK 06:55WN 264	3h 55m Oakland	OAK 10:50 → ONT 12:10WN 3062	7h 00m	96%	93%
Southwest Details →	PDX 05:30 → SMF 07:00WN 3211	2h 10m Sacramento	SMF 09:10 → ONT 10:30WN 3805	5h 00m	100%	92%
Delta Details →	PDX 05:45 → SLC 08:39DL 1270	2h 40m Salt Lake City	SLC 11:19 → ONT 12:10DL 3172	6h 25m	100%	90%
United Details →	PDX 05:00 → DEN 08:31UA 459	2h 54m Denver	DEN 11:25 → ONT 12:47UA 430	7h 47m	99%	87%
Delta Details →	PDX 09:30 → SEA 10:55DL 3953 · flown by SkyWest	3h 40m Seattle	SEA 14:35 → ONT 17:19DL 4031 · flown by SkyWest	7h 49m	99%	87%
Delta Details →	PDX 17:24 → SLC 20:19DL 1244	2h 40m Salt Lake City	SLC 22:59 → ONT 23:48DL 1614	6h 24m	99%	87%
Delta Details →	PDX 05:30 → SEA 06:41DL 4008 · flown by SkyWest	1h 44m Seattle	SEA 08:25 → ONT 11:17DL 4070 · flown by SkyWest	5h 47m	96%	85%
Alaska Details →	PDX 05:00 → SEA 05:53AS 2431 · flown by Horizon	2h 40m Seattle	SEA 08:33 → ONT 11:14AS 1364	6h 14m	100%	85%
Tight connection: often missed
United Details →	PDX 07:00 → SFO 08:56UA 2818	1h 44m San Francisco	SFO 10:40 → ONT 12:12UA 2661	5h 12m	74%	57%
American Details →	PDX 11:54 → DFW 17:49AA 2287	1h 01m Dallas-Fort Worth	DFW 18:50 → ONT 19:59AA 2236	8h 05m	71%	42%
Alaska Details →	PDX 12:03 → SEA 13:03AS 3078 · flown by SkyWest	47m Seattle	SEA 13:50 → ONT 16:30AS 571	4h 27m	73%	36%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

SEA · 1h 16m · leaves 06:19 2%

Afternoon and evening

SLC · 46m · leaves 19:20 16%

DFW · 1h 01m · leaves 11:54 29%

PHX · 50m · leaves 19:25 74%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


Southwest WN 3195 PDX 05:50 → DEN United UA 430 DEN 11:25 → ONT Connection details →	2h 10m	6h 57m	98%	87%
Alaska AS 3431 PDX 10:35 → SEA Delta DL 4031 SEA 14:35 → ONT Connection details →	2h 52m	6h 44m	98%	86%
Alaska AS 2431 PDX 05:00 → SEA Delta DL 4070 SEA 08:25 → ONT Connection details →	2h 32m	6h 17m	96%	84%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON